Lighthouse anti-patterns we keep seeing in production
Six performance mistakes we audit out of every Shopify store we inherit.
Six performance anti-patterns we audit out of every Shopify store we inherit.
The list
- Render-blocking JS in <head> — defer or async almost all of it.
- Unsized images — always declare width/height or aspect-ratio.
- Massive CSS bundles — Tailwind without purge, or theme CSS that contains every section even when most aren’t used.
- App-injected fonts — apps that load their own fonts double up your font payload.
- Slow API endpoints — Klaviyo identify calls in the head block first paint.
- No HTTP cache headers on static assets.
Performance is product. Stop punting it to the developer.
